What this MCB delivers on the panel
The Siemens 5SY4302-7CV is a 3-pole miniature circuit breaker with a C-curve trip characteristic rated at 2 A. Its interrupting capacity is 15 kA at 400 V AC — that figure governs fault clearing on a 400 V three-phase supply without upstream cascading.
DIN-rail fit and panel integration
Three-pole width at 2 A C-curve means it occupies three modular units (each 18 mm) in the enclosure.